Exhaust-muffler



G. A. BLAIN AND J. SCHERER.

EXHAUST MUFFLER.

APPLICATION FILED APR. 17. 1916.

, l ,344, 975. Patented June 29, 1920 .44' il" l UNITED STATES"liui'riarrr OFFICE.

GEORGE A. BLAIN AND JACOB SCHERER, OF LONG LAKE, MINNESOTA.

EXHAUST-MUFFLER.

Specification of Letters Patent.

Patented June 29, 1920.

Application filed April 1K7, 1918. Serial/No. 229,167.

To all ywhom it may concern: Be it known that we, GEORGE A. BLAIN andJACOB SCHERER, citizens of the .United States, residing at Long Lake,in. the county of Hennepin and State of Minnesota, having inventedcertain new and useful Improvements in Exhaust-Mufflers, of4

only soften the noise of the exhaust but willpreveiit clogging, willincrease the efficiency of the engine and will tend to keepdown heat inthe cylinders." A further lob]ect is to provide a inuifler having fansin which the bearings for the fan axle will not heat and bind. v Thefull objects and advantages of our invention will appear in connectionwith the detailed description thereof and are particularly pointed outin the claims.

Referring to the drawings, .which illustrate the application of ourinvention in one form, Figure l is a view mostly in central longitudinalsection. Fig. 2 is a section onthe line 2 2 of Fig. ll. Fig. 3 isa topplan view showing one way of connecting the muffler with an internalcombustion engine.

10 designates a' suitable frame for supporting the muflier whichincludes a cylinder 12 into one end of which is led the exhaust pipe 14from the engine. The portion of this pipe adjacent the cylinder 121spreferably covered with asbestos. The cylii i, der forms an expansionchamber and is preferably made from sheet metal having an asbestoscovering held in place by straps 16 passing around the cylinder. Themuffieris securely fastened to the frame by straps 18. 'Mounted inbearings 20 and 22 on the frame is a shaft 24 to which is secured apulley 26 driven'bya belt 28 from the fly wheel 30 on the engine shaft.It is, of course, obvious that the shaft 24 can be driven by anysuitable connection with a moving part of the engine. The bearings 2Oand 22 are not only provided with balls 32 to coperate with cones 34 onthe shaft, but are also provided with oil cups 36. The shaft extendsaxially through the cylinder 12 and is provided with a plurality of fans38 of ordinary lconstruction which are held conical deiector 44 issecured to the frame by brackets 48. The d'eiiector preferably consistsof lsheet metal covered on the rear, which is the inner surface of thecone, with asbestos, and is so positioned as to form an annular slit 46for the escape of gases from the muffler.

The operation and advantages of our muffier will be obvious from theforegoing description. .The cylinder l2 constitutes an expansion chamberinto which the gases discharged from the engine are sucked by the fanswhich force the gases out of the annular slit 4G. vBy means of thisconstruction not only do we obtain eflicient muifling of the exhaust,but the fans cause a sucking action which draws the products ofcombustion out of the cylinders of the engine at the time of exhaust,and the avoidance of back pressure at that time results in an the fansquickly removes the burned gasesl fromf the engine cylinders, and notonly prevents clogging but acts to keep down the heat in the cylinders,as demonstrated by tests which we made with a two and onehalf horsepower gasolene engine as follows. We used two gallons of water in athree gallon placket at a temperature of fifty degrees ahrenheit at thetime of starting. After running one hour with our muiiier the watershowed a temperature of one hundred and seventy-two degrees Fahrenheit,or a rise in temperatureofone hundred and twenty-two degrees Fahrenheit.A test made under the same conditions except that the engine was allowedto exhaust into the open air, at the end of one hour showed atemperatuie of one hundred and ninetyeight degrees Fahrenheit, or a risein temperature of one hundred and forty-eight degrecs Fahrenheit. A testmade under the same conditions except that an ordinary muffler was used,at the end of one hour Showed a temperature of two huudredand `ion eightdegrees Fahrenheit, or a rise of temperature of one hundred andfifty-eight degrees Fahrenheit. When -the above `tests were made theengine was pumping water from a one.hundred and ten foot well with a tenfoot lift.

We claim:

1. An exhaust muier comprising a casing, an exhaust pipe connecting oneend of said casing with an engine, a shaft extending axially throughsaid casing, a fan in said casing secured to said shaft, means forrotating said shaft, a conical deflector positioned to form an annularslot for the discharge of gases at the other end of said casing, and abearing Jfor said shaft at the rear of said deflector whereby saidbearing is protected from theaction of discharge gases 2. An exhaustmuiplier comprising a cylindrical casing, an exhaust pipe connecting oneend of said casing with an engine, a shaft extending axially throughsaid casing, a plurality of fans in said casing secured to said shaft,means for rotating said shaft, a conical defiector positioned to form anannular slit for the discharge of gases at the other end of said casing,the base of said conical deflector having a diameter substantially thesame as the diameter of said casing and a bearing for said shaft at therear of said deiiector whereby said bearing is protected from the actionof the discharged gases.

3. An exhaust muffler comprising a casing, an exhaust pipe connectingone end of said casing with an engine, a shaft extending axially throughsaid casing, ak fan in said casing secured to said shaft, a pulleysecured to said shaft whereby the latter may be driven from the engine,a conical asbestos backed deflector positioned to form an annular slitfor the discharge of gases at the Vrear. of said casing, the base ofsaid conical deiector having a diameter substantially the same as thediametenoi said casing, and a bearing for said shaft at the rear of saiddeflector whereby said bearing is protected from the actionA ofdischarged gases.

In testimony whereof we hereunto affix our signatures.'

GEORGE A. BLAIN. JACOB scHERER.

